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Different effects of conventional and biodegradable microplastics on the amelioration process of cadmium-contaminated soil
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Researchers found that conventional and biodegradable microplastics had different effects on the passivator-based remediation of cadmium-contaminated soil, with biodegradable microplastics showing less interference with the amelioration process compared to conventional plastics.
With the emergence of complex soil pollution problems, the combined contamination of heavy metals and microplastics (MPs) should not be overlooked. Particularly, the safe use of farmland soils deserves more attention. Passivators were commonly used for heavy metal-contaminated soil amelioration. However, the potential impact of MPs on this process is yet to be determined. Herein, the cadmium-contaminated paddy soil was collected to evaluate the effect of MPs on soil properties and bacterial community in soil amelioration. Two types of MPs were investigated, including conventional polyethylene (PE) and biodegradable polylactic acid (PLA). Both MPs decreased the available phosphorus content and bioavailability of cadmium in a similar way, while they changed the soil pH and nitrogen species in a different manner. Additionally, the high-dose PLA treatment induced a considerable decrease in soil pH (from ~5.4 to 3.6), with potential considerable release of carbon substrates and modification of bacterial community. Furthermore, for the ameliorated soil, it has a network structure of less complexity and stabilization, which resulted in greater disparities in the microbial community under different MP treatments. Profiling predicted functions provides insights into the potential correlations among bacterial activities and soil physicochemical properties. The study demonstrated that both PE and PLA could have significant effects on the soil amelioration process and pose a threat to agroecosystems.
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Differential Impacts of Conventional and Biodegradable Microplastics on Cadmium Transfer in a Soil-Earthworm-Lettuce System
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Researchers compared how conventional and biodegradable microplastics affect cadmium transfer through a soil-earthworm-lettuce system. They found that high doses of conventional microplastics increased cadmium concentrations in lettuce shoots by 54 percent and in earthworms by 80 percent, while biodegradable microplastics actually decreased shoot cadmium by 30 percent. The study suggests that different types of microplastics have opposing effects on heavy metal contamination in the food chain.
Differential Impactsof Conventional and BiodegradableMicroplastics on Cadmium Transfer in a Soil-Earthworm-Lettuce System
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A microcosm experiment tested how conventional and biodegradable microplastics affected cadmium transfer in a soil-earthworm-lettuce system. High doses of conventional MPs increased cadmium in plant shoots by 54% and in earthworms by 80%, while biodegradable MPs had less effect, suggesting polymer type matters for metal contamination risk in agroecosystems.
Relevance of dissolved organic matter components on the adsorption behaviors of cadmium onto non-biodegradable and biodegradable microplastics in an agricultural soil
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Researchers found that microplastics in agricultural soil — both conventional and biodegradable types — reduce the soil's ability to bind cadmium, a toxic heavy metal, largely by altering organic matter that controls metal mobility. This suggests microplastic contamination could increase cadmium availability in farmland, raising potential food safety concerns.
Effects of microplastics in soil on the regulation of cadmium bioavailability by biochar
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Researchers investigated how biochar amendments affect cadmium bioavailability in soils co-contaminated with microplastics, finding that the presence of microplastics altered cadmium mobility and complicated biochar's remediation effectiveness in ways that depend on the specific MP type present.
Environmental effects of biodegradable microplastics in cadmium-contaminated soil and their regulation on cadmium bioavailability.
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A pot experiment tested four biodegradable microplastics (PLA, PBAT, PBS, PCL) in cadmium-contaminated soil growing pak choi. PBAT reduced plant cadmium uptake and plant stress, while PLA, PBS, and PCL increased cadmium availability, plant uptake, and plant damage, with effects linked to changes in soil chemistry and soil bacteria.
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